Per serving
These open face sandwiches will be a hit with the whole family!
Preheat the broiler.
Arrange the bread slices in a single layer on a baking sheet.
Broil 4 to 5 inches from the heat source for about 2 minutes per side, or until lightly toasted.
(Or toast the bread in a toaster.) Spread 1 side of each slice with mayonnaise.
To make the topping: Heat the olive oil in a large nonstick skillet over medium-high heat; add the mushrooms, zucchini, onion, and garlic.
Cook, stirring occasionally, until tender, about 5 minutes.
Remove from the heat; stir in the salt and pepper.
Taste and adjust the seasoning.
Combine the cheeses in a small bowl.
Top each bread slice with 2 tomato slices, a sprinkling of pepper, and half of the sautéed vegetables, lettuce or bean sprouts, and the cheese mixture.
Place the sandwiches on the baking sheet.
Broil for about 2 minutes, or until the cheese is melted.
Enjoy!
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